JPH0344124B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a device for removing initial slag on the upper surface of a ladle of molten steel mixed in from a smelting furnace such as an LD or an EF, and more specifically, , relates to a slag removal device for a ladle refining facility in which a ladle unloading station, a heating device, a degassing device, and a slag removal field are arranged on a circular closed loop at intervals in the circumferential direction.

<Prior Art> Molten steel taken out from various types of converters is stored in ladle at any time, and as required, various types of out-of-furnace refining are performed prior to casting. There are various types of refining equipment, but recently powder additives for refining (for example,
CaC ₂ , Ca−Si, etc.) with a carrier gas (usually
Refining equipment (commonly referred to as calcium injection equipment, hereinafter referred to as KAT equipment) is used to control inclusions, desulfurize, deoxidize, etc. by injecting with Ar).

Furthermore, a heating device for retaining or heating the molten steel, a degassing device for removing dissolved gas from the molten steel, etc. are also used. Conventionally, these devices have been installed independently, and alloying components have been added to each device independently as necessary. dehydrogenation is considered to be particularly important, and their relationship is attracting attention.

That is, the above-mentioned KAT device, heating device, degassing device, etc. are each installed as independent equipment,
Moreover, the reality is that they are located in remote locations. Therefore, a special crane is required to transport the ladle to these devices, and a crane or a ladle-carrying cart is also required between each device.

Furthermore, depending on the type of steel and its intended use, these processing steps may differ, with some requiring only passing through a heating device and a degassing device, others simply passing through a heating device and a KAT device and omitting the degassing device, and others. Various processes are used, such as directly transporting the gas into the KAT device without passing it through a heating device, and then transporting it into a degassing device. Therefore, the ladle conveyance line that connects these needs to be configured to accommodate these. In addition, since these devices are installed separately, it is necessary to install an independent alloy powder charging device and/or exhaust gas device for each, which increases equipment costs and is also inconvenient in terms of operation management and operation. There are many. On the other hand, in recent years, the continuous casting method has been widely adopted in place of the ordinary ingot making method from the viewpoint of productivity, yield improvement, energy saving, labor saving, etc. In order to achieve this, it is necessary to continuously prepare and supply molten steel of the desired quality to the continuous casting process.

However, on the converter side, which is in a position to supply this, the blowing time and quality of molten steel vary considerably depending on the charge, and the subsequent processing steps are also affected by this and vary depending on the steel type. With the conventional equipment configuration, it is often difficult to continuously and efficiently supply molten steel of the quality required in the continuous casting process. Therefore, the current situation is that the advantages of the continuous casting method are not fully utilized.

Focusing on this point of view, the applicant of the present application previously proposed a molten steel processing apparatus in Japanese Patent Application Laid-open No. 164020/1983, and the proposed technology allows the processing process to be carried out continuously. Improve productivity.

The distance between each processing device can be shortened, eliminating the need for a traveling crane, reducing processing time and increasing production.

Since each processing device is disposed close to each other, it is easy to centrally manage operations.

Ancillary equipment can be centrally installed and also shared, reducing equipment costs.

It requires less floor space and can be installed on a limited site.

Processing can be freely combined according to the target quality.

were able to receive benefits such as

<Problems to be Solved by the Invention> However, the previously proposed technology does not disclose a specific configuration as to how to remove the initial slag on the upper surface of the molten steel contained in the ladle. .

A conventional technology for removing slag in a ladle smelting facility is the ASEA-SKF method, in which each processing device is arranged in a straight line. It is relatively easy to install, tilt, and drain the slag from the outside with a slag dragger, and in the case of a linear arrangement, wiring of power cables for the tilting device, etc. can be relatively easily done.

However, when traveling in a closed loop, power must be supplied to the drive device from the surrounding area using a rigid trolley, which poses challenges in terms of thermal protection of the trolley wire and connection due to the nature of ladle refining equipment. .

It is an object of the present invention to facilitate the power supply to the tilting device and also to make it possible to tilt even if there are a plurality of ladles with one tilting device.

<Means for Solving the Problems> The technical means taken by the present invention to achieve the above-mentioned object are a ladle unloading station, a heating device for heating molten steel in a ladle, a degassing device, and a waste slag. The fields are arranged at intervals in the circumferential direction on a circular closed loop, and the ladle containing molten steel carried into the ladle unloading field is transferred to the heating device degassing device and the slag discharge field in the closed loop. A cart or a pot loading stand is provided to be moved on the cart or the pot loading stand, and a pot tilting stand is further provided on the cart or the pot loading stand, the outer lower part of which is tiltably supported via a horizontal shaft and the inner upper part of which has an engaged portion. A telescopic pot tilting mechanism is provided on a fixed side deck that corresponds to the sludge drainage field in the radial direction, and the end of the pot tilting mechanism pushes up the engaged portion from below. Furthermore, a slag dragger for discharging slag from the upper surface of the pot is provided in a radially outer region corresponding to the pot tilting mechanism.

<Function> A ladle 15 containing molten steel is attached via a crane or the like to the pan tilting table 10 of the truck 9 or the ladle loading platform 9 that is waiting on the ladle unloading station 1.

The ladle 15 travels and stops on the closed loop 6 to each treatment plant such as the heating device 3 or the degassing device 5 and enters a predetermined treatment process, but prior to this,
It is necessary to discharge the slag on the upper surface of the molten steel in the ladle 15.

Therefore, the ladle 1 is loaded via the cart 9 or the ladle loading platform 9.
5 is moved to the slag dumping site 2, and the cart 9 and the like are stopped at the sludge dumping site 2 in a state where they are mechanically locked so that they cannot be moved.

When the ladle 15 is stopped and fixed in the slag dumping area 2, the telescopic pan tilting mechanism 22 is extended, and its end is engaged and locked with the engaged portion 14 of the pan tilting table 10, so that it can be pushed up from below. As a result, the ladle tilting table 10 is tilted outward in the radial direction about the horizontal axis 11 as shown in FIG. 2, and the ladle 15 is tilted.

The operator of the slag dragger 34 checks the amount of molten steel and slag in the ladle, stops the tilting angle at the best angle, and then operates the slag dragger 34 to discharge the slag to the slag ladle 36.

After the slag removal is completed, the operator of the slag dragger 34 returns the pot tilting mechanism 22 to the standby state by remote control, releases the engagement lock with the engaged portion 14 and removes the mechanical lock, and then proceeds to the next processing step. Migrate.

<Example> Embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a schematic plan view of the layout of the ladle refining equipment, where 1 is a ladle unloading area, and 2 is a slag removal area, which also serves as a protector attachment/removal station in this example.

Reference numeral 3 denotes a heating device, 4 a KAT device, and 5 a vacuum degassing device. The above-mentioned devices and processing stations 1 to 5 are arranged in an annular closed loop 6 at intervals in the circumferential direction.

A support 7 is erected at the center of the closed loop 6, and a fixed deck 8 is provided in a projecting manner from the support 7.

9 is a trolley or a pot loading platform, and the closed loop 6 mentioned above is
In this example, two swing arms 10 are attached to the support column 7, and each can move independently along the trajectory of the closed loop 6. Note that the trolley 9 and the like may be of a self-propelled type separated from the support 7, and in addition to the two shown in the figure, one or three or more may be used.

A pot tilting table 10 is provided on the cart 9 or the pot loading table (hereinafter referred to as the table).

The pot tilting stand 10 has an outer lower part supported on the stand 9 so as to be tiltable via a horizontal shaft 11, and an inner lower part serving as legs 12 and supported on the stand 9.

The pot tilting table 10 has a hook-shaped recess 13 formed on its upper surface, and has an engaged portion 14 indicated by a pin on its inner upper portion.

The ladle 15 containing molten steel is attached to the ladle tilting table 10 on the platform 9 at the ladle unloading area 1 via a traveling crane or the like, and the ladle 15 is fitted into and removed from the recesses 13 on both side walls. It has a trunnion support bracket 16.

One side elevational portion 13A of the recessed portion 13, that is,
A slip prevention mechanism 17 is attached to the vertical surface 13A on the radially inward side of the closed loop 6, and when the trunnion support bracket 16 of the ladle 15 is inserted into the recess 13, the slip prevention mechanism 17 locks the support bracket 16 into the first position. The ladle 15 is prevented from slipping by pressing in the direction of arrow F in FIG.

That is, as shown in FIGS. 3 and 4, the anti-slip mechanism 17 has a pair of brackets 18 fixed to the vertical surface 13A, and between the brackets 18, a swinging lever 20 having upper and lower rollers 19 is connected to a pin 21. It is composed of pivots.

Therefore, before the trunnion support bracket 16 is inserted, the swing lever 20 moves in the direction of the arrow A in FIG.
By inserting the trunnion support bracket 16 into the recess 13 in this state, the swing lever 20 is swung in the direction opposite to the A direction, and the vertical surface of the trunnion support bracket 16 and the recess 13 are The lower roller 19 is interposed between the inclined vertical surfaces 13A by a wedge action, and presses the trunnion support bracket 16 in the direction of arrow F as a relative movement.

FIG. 5 shows a second embodiment of the anti-shake mechanism 17, in which the upper end of a swinging lever 20 is pivotally supported between brackets 18 by a pin 21, and the swinging lever 20 is
is made of a plate spring, and a pressing force in the F direction can be applied by wedge action and spring action.

FIG. 6 shows a third embodiment of the anti-shake mechanism 17, in which the lower roller 19 in the first embodiment shown in FIG. It's the same.

In either embodiment, the anti-slip mechanism 17
When the ladle tilting table 10 is tilted as shown in FIG. Any material that applies pressing force may be used.

A pan tilting mechanism 22 is provided on the fixed deck 8 corresponding to the slag discharge field 2 in the radially inward direction of the closed loop 6.

As shown in the details of the first embodiment in FIG. 7, the pot tilting mechanism 22 has a fluid cylinder tube 25 pivoted in the middle via a horizontal pin 24 to a bracket 23 fixed on a fixed deck 8. A hook 27 is attached to the end of a piston rod 26 that is slidably inserted into the tube 25.

Furthermore, a lock lever 28 is pivotally supported on the hook 27 by a pin 29, and the lock lever 28 is
is operated by a locking cylinder 30.

Furthermore, a balance weight 31 is attached to the lower end of the cylinder tube 25, and when the ladle 15 is run on the closed loop 6 via the platform 9,
In order to avoid interference between the ladle tilting mechanism 22 and the ladle side, the ladle tilting mechanism 22 can be held in the retracted position B in FIG. 7 by the cooperation of the balance weight 31 and stopper 32 described above.

Additionally, in FIG. 7, 33 is a guide, which guides the hook 27 parallel to the tube axis.

Therefore, when the ladle 15 containing molten steel mounted on the platform 9 via the pan tilting platform 10 is transferred to the slag disposal area 2, the platform 9 is immobilized by a locking mechanism (not shown) and then operating the pan tilting mechanism 22 in the extension direction;
The hook 27 is fitted into the engaged portion 14 from below, and then the locking cylinder 30 is automatically extended to sandwich the engaged portion 14 between the hook 27 and the lock lever 28.

When the pan tilting mechanism 22 is further extended in this state, the pan tilting table 10 is brought into the tilting posture C shown by the imaginary line in FIG. 7 or the solid line in FIG. 2 via the horizontal axis 11.
The ladle 15 will be tilted radially outward.

As shown in FIG. 2, a known slag dragger 34 is mounted on a deck 35 in a radially outer region corresponding to the pan tilting mechanism 22, and is movably mounted on a deck 35.
A slag removal ladle 36 is provided at the lower part corresponding to the tilting of the ladle, and a dust collection hood 37 is provided at the upper part.

Therefore, when the ladle 15 is set in the tilted posture C as described above, the operator on the slag dragger 34 checks the amount of molten steel and slag in the ladle, stops at the best angle, and then operates the slag dragger 34. The slag in the ladle 15 is then discharged into the slag ladle 36, and the dust floating at this time is collected and discharged through the suction blower of the dust collection hood 37.

After the slag removal is completed, the operator of the slag drudger 34 uses a push button to remotely control the ladle tilting mechanism 22 (other than this is done in the ladle refining central control room) to reduce the horizontal axis. 11 is used as a fulcrum to return the ladle 15 to its previous horizontal position.
0 is automatically reduced, and the pan tilting mechanism 22 is placed in the retracted position B.

Therefore, when this slag discharge is completed, the ladle 15 is moved to one of the processing steps such as the heating device 3, the degassing device 5, the KAT device 4, etc. by running the platform 9 on the closed loop 6. .

In Fig. 1, 38 is a stirrer for stirring molten steel during heat treatment, 39 is a stirrer for stirring molten steel during vacuum degassing treatment, and each stirrer 38, 39 is movable in and out in the radial direction. It is attached to the stands 38A and 39A and provided on the fixed deck 8.

FIG. 8 shows a second embodiment of the pan tilting mechanism 22,
The piston rod 26 shown in FIG.
A, the screw shaft 26A is made expandable and retractable within the screw tube 25A by a power cylinder 26B, and the rest of the configuration is the same as the embodiment shown in FIG. 7, so the common members are the same. It is indicated by a symbol.

<Effects of the Invention> The present invention provides a method in which a ladle unloading station, a heating device for heating molten steel in a ladle, a degassing device, and a slag removal site are arranged at intervals in the circumferential direction on an annular closed loop. The system is equipped with a trolley or a ladle loading platform that moves the molten steel storage ladle carried into the ladle unloading area to the heating device, degassing device, and slag area on the closed loop. Provides basic effects.

Processing steps can be performed continuously, improving productivity.

The distance between each processing device can be shortened, eliminating the need for a traveling crane, reducing processing time and increasing production.

Since each processing device is disposed close to each other, it is easy to centrally manage operations.

Ancillary equipment can be centrally installed and also shared, reducing equipment costs.

It requires less floor space and can be installed on a limited site.

Processing can be freely combined according to the target quality.

Furthermore, in the present invention, a pot tilting platform is provided on the cart or the pot loading platform, the outer lower part of which is tiltably supported via a horizontal shaft, and the inner upper part of which has an engaged part, and which is connected to the slag discharge field and the diameter thereof. A telescoping pot tilting mechanism that pushes up the engaged portion from below is provided on the fixed side deck corresponding to the inner side, and an end of the pot tilting mechanism can be freely engaged with and detached from the engaged portion. Furthermore, since a slag dragger for discharging slag on the upper surface of the pot is provided in the radially outer region corresponding to the pot tilting mechanism, the following unique functions and effects are achieved.

By locating the tailings field to the ladle smelting equipment, smelting work can be centralized and the number of workers can be reduced.

Since multiple pots are run in a circular closed loop, processing can be performed using a single pot tilting mechanism.

Maintenance can be facilitated by separating the pot tilting mechanism from the ladle car, ie, the trolley, etc., and placing it on the fixed side.

Since the pan tilting mechanism is provided inside the closed loop of the slag dumping area, and the slag dragger is provided in the outside area, the slag slag removal work can be carried out efficiently and with a compact design.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, in which Fig. 1 is a conceptual plan view of the equipment layout, Fig. 2 is an elevational side view showing the pan tilting section, and Fig. 3 is a side view showing details of the slippage prevention mechanism. , FIG. 4 is a front view of FIG. 3, and FIGS. 5 and 6 are side views showing two examples of the anti-slip mechanism.
FIG. 7 is a side view showing the first embodiment of the pot tilting mechanism, and FIG. 8 is a side view showing the second embodiment. 1...Pot unloading area, 2...Slag dumping area, 3...Heating device, 4...Degassing device, 6...Closed loop, 8...
Fixed deck, 9... Trolley or pot loading platform, 10...
Pot tilting table, 11...Horizontal axis, 14...Engaged portion, 2
2... Pot tilting mechanism, 34... Slag dragger.

Claims (1)

[Claims] 1. A ladle unloading area, a heating device for heating molten steel in a ladle, a degassing device, and a slag removal area are arranged at intervals in the circumferential direction on a circular closed loop,
A trolley or a ladle loading platform is provided for moving the molten steel storage ladle carried into the ladle unloading area to the heating device, degassing device, and slag area on the closed loop, and a is provided with a pot tilting table whose outer lower part is tiltably supported via a horizontal shaft and which has an engaged part at the inner upper part, and on the fixed side deck corresponding to the slag discharge field in the radial inward direction. A telescoping pan tilting mechanism that pushes up the engaged portion from below is provided, the end of the pan tilting mechanism is capable of engaging and disengaging from the engaged portion, and the end of the pan tilting mechanism has a diameter corresponding to that of the pan tilting mechanism. A slag removal device for ladle refining equipment, characterized in that a slag dragger for removing slag on the upper surface of a ladle is provided in an outer region of the ladle.